Apparatus for manufacturing secondary battery case

Abstract

The present disclosure relates to an apparatus for manufacturing a secondary battery case, and a technical problem to be solved is to provide an apparatus for manufacturing a secondary battery case capable of simultaneously performing a molding process and an imprinting process for a case. To this end, the present disclosure comprises: a die having a first surface and a second surface opposite to each other; a punch hole formed through the first surface and the second surface; a punch that is disposed to face the first surface and presses a workpiece toward the punch hole in a first direction; a knockout member that is disposed to face the second surface and presses the workpiece in a second direction opposite to the first direction; and a stamp member that is installed on the knockout member, and imprints a pattern on the workpiece as the knockout member comes in contact with the workpiece.

Description

Secondary battery case manufacturing device

[0001] The present disclosure relates to a secondary battery case manufacturing device.

[0002] In general, the recent rapid proliferation of battery-powered electronic devices, such as mobile phones, laptops, and electric vehicles, has led to a rapid increase in demand for high-energy density and high-capacity secondary batteries. Accordingly, active research and development is underway to improve the performance of lithium secondary batteries.

[0003] A lithium secondary battery is a battery that includes a positive electrode and a negative electrode that contain active materials capable of intercalating and deintercalating lithium ions, and an electrolyte, and produces electrical energy through oxidation and reduction reactions when lithium ions are intercalated / deintercalated from the positive electrode and negative electrode.

[0004] The case of such a secondary battery can be manufactured by forming a sheet-shaped slug into a square or circular can shape using an extrusion method or an ironing method.

[0005] The above-described information disclosed in the background technology of this invention is only intended to improve understanding of the background of the present invention, and therefore may include information that does not constitute prior art.

[0006] The purpose of the present invention is to provide a secondary battery case manufacturing device capable of simultaneously performing a case molding process and an imprinting process.

[0007] However, the technical problems to be solved by the present invention are not limited to the problems described above, and other problems not mentioned can be clearly understood by those skilled in the art from the description of the invention described below.

[0008] According to one embodiment of the present invention for solving the above technical problem, a secondary battery includes: a die having a first surface and a second surface that are opposite to each other; a punch hole formed by penetrating the first surface and the second surface; a punch disposed to face the first surface and press a workpiece toward the punch hole in a first direction; a knockout member disposed to face the second surface and press the workpiece in a second direction opposite to the first direction; and a stamp member installed on the knockout member and imprinting a pattern on the workpiece when the knockout member comes into contact with the workpiece.

[0009] The knockout member includes a knockout body that is arranged to face the second surface and moves along the first direction or the second direction; and a knockout pad that is installed to be reciprocally movable along the first direction and the second direction with respect to the knockout body and comes into contact with the workpiece; and the stamp member can selectively come into contact with the workpiece depending on the movement direction of the knockout pad.

[0010] The above knockout pad can be inserted into the punch hole as the knockout body moves along the second direction.

[0011] The stamp member includes a stamp hole formed by penetrating the knockout pad and positioned to face the punch hole; a stamp rod extending from the knockout body toward the stamp hole; and a stamp extending from the stamp rod and positioned inside the stamp hole; wherein the stamp can protrude outward from the stamp hole as the knockout pad moves relative to the knockout body in a first direction.

[0012] The above stamp can extend from an end of the stamp rod along the second direction.

[0013] The above stamp member may further include a support member disposed between the knockout body and the stamp rod, and supporting the stamp rod with respect to the knockout body.

[0014] The above support member may be provided to be elastically deformable.

[0015] The knockout member may further include an elastic member that presses the knockout pad in the second direction; and a stopper that prevents the knockout pad from being separated from the knockout body.

[0016] The above elastic member may be a coil spring.

[0017] The above elastic member can be placed between the knockout body and the knockout pad.

[0018] The elastic member is arranged such that its length is parallel to the first direction, and both ends can be fixed to the knockout body and the knockout pad, respectively.

[0019] The stopper may include a first stopper extending from the knockout body; and a second stopper extending from the knockout pad and coming into contact with the first stopper as the knockout pad moves relative to the knockout body in the second direction.

[0020] The first stopper includes a first stopper body fixed to the knockout body; and a first hook extending from the first stopper body in a direction intersecting the first direction and having a first contact surface; and the second stopper includes a second stopper body fixed to the knockout pad; and a second hook extending from the second stopper body in a direction opposite to the extension direction of the first hook and having a second contact surface arranged to face the first hook; and the first hook and the second hook can be sequentially arranged along the first direction.

[0021] The first contact surface and the second contact surface may be arranged parallel to each other.

[0022] The stamp may protrude outwardly from the stamp hole as the knockout pad moves in the first direction relative to the knockout body from the initial position by a first set distance.

[0023] The second stopper may come into contact with the knockout body as the knockout pad moves from the initial position in the first direction relative to the knockout body by a second set distance greater than the first set distance.

[0024] The above knockout member may further include a guide member that guides relative movement of the knockout pad with respect to the knockout body.

[0025] The above guide member may include a guide hole formed by penetrating one of the knockout body and the knockout pad; and a guide rod extending from the other of the knockout body and the knockout pad and inserted into the guide hole.

[0026] The above guide hole and the above guide rod can be arranged parallel to the first direction.

[0027] According to an embodiment of the present invention, the case forming process and the stamping process can be performed simultaneously by the knockout member and the stamp member, thereby enabling high-speed production of the secondary battery case.

[0028] According to an embodiment of the present invention, since the stamp selectively protrudes from the stamp hole in the direction of movement of the knockout pad, damage to the workpiece and the stamp due to collision between the workpiece and the stamp during the process of transporting the workpiece can be prevented, and deterioration of the engraving performance due to damage to the stamp can be prevented.

[0029] According to an embodiment of the present invention, since the stamp protrudes from the stamp hole only when imprinting a pattern on a workpiece, wear of the stamp due to constant exposure of the stamp can be prevented, and damage to the stamp due to collision between the punch and the stamp during a blank punching operation can be prevented.

[0030] The following drawings attached to this specification illustrate preferred embodiments of the present invention, and together with the detailed description of the invention described below, serve to further understand the technical idea of ​​the present invention, and therefore, the present invention should not be interpreted as being limited to matters described in such drawings.

[0031] FIG. 1 is a perspective view schematically showing the configuration of a secondary battery case manufacturing device according to one embodiment of the present invention.

[0032] FIG. 2 is an exploded perspective view schematically showing the configuration of a secondary battery case manufacturing device according to one embodiment of the present invention.

[0033] FIG. 3 is an exploded perspective view showing the configuration of a secondary battery case manufacturing device according to one embodiment of the present invention at a different point in time from FIG. 3.

[0034] Figure 4 is a cross-sectional view schematically showing the configuration of a secondary battery case manufacturing device according to one embodiment of the present invention.

[0035] FIG. 5 is an exploded perspective view schematically showing the configuration of a knockout member and a stamp member according to one embodiment of the present invention.

[0036] FIG. 6 is an exploded perspective view showing the configuration of a knockout member and a stamp member according to one embodiment of the present invention at a different point in time from FIG. 5.

[0037] Fig. 7 is a cross-sectional view schematically showing the configuration of a knockout member and a stamp member according to one embodiment of the present invention.

[0038] Figure 8 is an enlarged view schematically showing the configuration of a stopper according to one embodiment of the present invention.

[0039] Figure 9 is an enlarged view schematically showing the configuration of a stamp according to one embodiment of the present invention.

[0040] FIGS. 10 to 15 are drawings schematically showing the operation process of a secondary battery case manufacturing device according to one embodiment of the present invention.

[0041] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Prior to this, terms or words used in this specification and claims should not be interpreted as limited to their typical or dictionary meanings, and should be interpreted with meanings and concepts that conform to the technical spirit of the present invention based on the principle that the inventor can appropriately define the concept of a term to best explain his or her own invention. Therefore, the embodiments described in this specification and the configurations illustrated in the drawings are only some of the most preferred embodiments of the present invention and do not represent all of the technical spirit of the present invention. Therefore, it should be understood that various equivalents and modified examples may exist as substitutes for them at the time of filing this application.

[0042] Additionally, when used herein, the terms "comprise", "include" and / or "comprising", "including" specify the presence of stated features, numbers, steps, operations, elements, elements and / or groups thereof, but do not preclude the presence or addition of one or more other features, numbers, operations, elements, elements and / or groups thereof.

[0043] Additionally, to facilitate understanding of the invention, the attached drawings are not drawn to scale and some components may be exaggerated in size. Furthermore, identical components may be assigned the same reference numbers in different embodiments.

[0044] The statement that two compared objects are "identical" means "substantially identical." Therefore, "substantially identical" may include deviations considered low in the art, such as deviations of less than 5%. Furthermore, uniformity of a parameter over a given region may imply uniformity on average.

[0045] Although terms like "first" and "second" are used to describe various components, these components are not limited by these terms. These terms are used merely to distinguish one component from another, and unless otherwise specified, a "first" component may also be a "second" component.

[0046] Throughout the specification, unless otherwise specifically stated, each element may be singular or plural.

[0047] Any configuration being placed "on (or under)" or "above (or below)" a component may mean not only that any configuration is placed in contact with the upper surface (or lower surface) of said component, but also that other configurations may intervene between said component and any configuration placed on (or below) said component.

[0048] Additionally, when a component is described as being "on," "connected to," or "coupled to" another component, it should be understood that the components may be directly connected or coupled to one another, but that other components may also be "interposed" between the components, or that each component may be "connected," "coupled," or "connected" through other components.

[0049] As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items. Furthermore, the use of "may" when describing embodiments of the present disclosure refers to "one or more embodiments of the present disclosure." Expressions such as "one or more" and "one or more" preceding a list of elements modify the list as a whole and do not modify individual elements in the list.

[0050] When reference is made throughout the specification to “A and / or B,” this means A, B, or A and B, unless otherwise stated, and when reference is made to “C through D,” this means C or more and D or less, unless otherwise stated.

[0051] When phrases such as "at least one of A, B, and C," "at least one of A, B, or C," "at least one selected from the group A, B, and C," or "at least one selected from A, B, and C," are used to specify a list of elements A, B, and C, the phrases can refer to any suitable combination.

[0052] The term "use" may be considered synonymous with the term "utilize." As used herein, the terms "substantially," "about," and similar terms are used as terms of approximation rather than degrees, and are intended to take into account inherent variations in measured or calculated values ​​that would be recognized by those skilled in the art.

[0053] Although terms such as first, second, third, etc. may be used herein to describe various elements, components, regions, layers, and / or sections, these elements, components, regions, layers, and / or sections should not be limited by these terms. These terms are used to distinguish one element, component, region, layer, or section from another element, component, region, layer, or section. Thus, a first element, component, region, layer, or section discussed below could also be termed a second element, component, region, layer, or section without departing from the teachings of the exemplary embodiments.

[0054] For ease of explanation, spatially relative terms such as "beneath," "below," "lower," "above," "upper," and the like may be used herein to describe the relationship of one element or feature to another element(s) or feature(s) as depicted in the drawings. It will be understood that spatially relative positions encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. For example, if the device in the drawings is turned over, an element described as "beneath" or "below" another element would be understood to be "above" or "above" the other element. Thus, the term "beneath" can encompass both the above and below orientations.

[0055] The terminology used herein is for the purpose of describing embodiments of the present disclosure and is not intended to be limiting of the present disclosure.

[0056] FIG. 1 is a perspective view schematically showing the configuration of a secondary battery case manufacturing device according to one embodiment of the present invention, FIG. 2 is an exploded perspective view schematically showing the configuration of a secondary battery case manufacturing device according to one embodiment of the present invention, FIG. 3 is an exploded perspective view schematically showing the configuration of a secondary battery case manufacturing device according to one embodiment of the present invention from a different viewpoint from FIG. 3, and FIG. 4 is a cross-sectional view schematically showing the configuration of a secondary battery case manufacturing device according to one embodiment of the present invention.

[0057] Referring to FIGS. 1 to 4, a secondary battery case manufacturing device according to the present embodiment includes a die (100), a punch hole (200), a punch (300), a knockout member (400), and a stamp member (500).

[0058] The die (100) may have a plate shape with a first surface (101) and a second surface (102) that are opposite to each other. The die (100) may be fixed to the ground or a separate structure (not shown) by various types of joining methods such as welding, bolting, and fitting. Hereinafter, the first surface (101) and the second surface (102) of the die (100) will be described as the upper surface and the lower surface of the die (100) perpendicular to the Z-axis, respectively, based on FIGS. 1 to 3.

[0059] The punch hole (200) can be formed to have the shape of a hole formed by penetrating the first surface (101) and the second surface (102) of the die (100). The punch hole (200) can function as a configuration that plastically deforms the workpiece (A) together with the punch (300) described below to process the workpiece (A) into a target shape.

[0060] Here, the workpiece (A) can be exemplified as an object to be manufactured into a secondary battery case by the secondary battery case manufacturing apparatus according to the present embodiment. The workpiece (A) can be provided in a form preformed into a cup shape by an extrusion process. Alternatively, the workpiece (A) can also be provided in the form of a sheet formed from a metal material such as aluminum. The target shape of the workpiece (A) is the shape of the secondary battery case manufactured by the secondary battery case manufacturing apparatus according to the present embodiment, and various design changes are possible within the range of a cylindrical shape with one side open, such as a cylinder, in addition to a rectangular parallelepiped. The cross-sectional shape, area, etc. of the punch hole (200) can be variously designed and changed depending on the cross-sectional shape, area, etc. of the secondary battery case formed by processing the workpiece (A).

[0061] The workpiece (A) can be transported on the first surface (101) of the die (100) by a separate transport device (not shown). The workpiece (A) can be placed at a position where its bottom surface faces the punch hole (200) prior to the operation of the punch (300) described below.

[0062] The punch (300) may be positioned to face the first surface (101) of the die (100). The punch (300) may be installed to be movable in a first direction and a second direction with respect to the first surface (101) of the die (100). The first direction described below refers to a direction that is parallel to the Z-axis with reference to FIGS. 1 to 3 and moves from the first surface (101) toward the second surface (102), and the second direction refers to a direction opposite to the first direction, that is, a direction that is parallel to the Z-axis with reference to FIGS. 1 to 3 and moves from the second surface (102) toward the first surface (101).

[0063] The punch (300) may be arranged such that its length direction is parallel to the first direction. One end of the punch (300), that is, the lower end based on FIGS. 1 to 3, may be arranged to face the punch hole (200). The other end of the punch (300), that is, the upper end based on FIGS. 1 to 3, may be connected to a separate power device (not shown) such as a press or cylinder via a punch holder (H). The punch (300) may be reciprocated in the first and second directions by a driving force generated from the power device.

[0064] The punch (300) can press the workpiece (A) toward the punch hole (200) in the first direction as it moves in the first direction. The cross-sectional area of ​​the punch (300) can be formed smaller than the cross-sectional area of ​​the punch hole (200). Accordingly, the punch (300) can be inserted into the punch hole (200) together with the workpiece (A) and extrude the workpiece (A) in the first direction or perform an ironing process to reduce the thickness of the workpiece (A).

[0065] The knockout member (400) may be arranged to face the second surface (102) of the die (100). The knockout member (400) may be installed to be movable in the first direction and the second direction with respect to the second surface (102). The knockout member (400) may be moved in the second direction and pressurize the workpiece (A) in the second direction after the punch (300) presses the workpiece (A) in the first direction. That is, the knockout member (400) may function as a configuration that applies a pressing force to the workpiece (A) in the opposite direction to the punch (300) after the workpiece (A) is formed by the punch (300) to detach the workpiece (A) from the punch hole (200).

[0066] FIG. 5 is an exploded perspective view schematically showing the configuration of a knockout member and a stamp member according to one embodiment of the present invention, FIG. 6 is an exploded perspective view schematically showing the configuration of a knockout member and a stamp member according to one embodiment of the present invention from a different viewpoint from FIG. 5, and FIG. 7 is a cross-sectional view schematically showing the configuration of a knockout member and a stamp member according to one embodiment of the present invention.

[0067] Referring to FIGS. 1 to 7, the knockout member (400) may include a knockout body (410) and a knockout pad (420).

[0068] The knockout body (410) forms one side of the outer surface of the knockout member (400), and can be arranged so that one side, that is, the upper side with reference to FIG. 5, faces the second side (102) of the die (100). The knockout body (410) can be connected to a separate power device (not shown), such as a press or cylinder. The knockout body (410) can be reciprocated in the first direction and the second direction by a driving force generated from the power device.

[0069] The knockout pad (420) can be positioned between the knockout body (410) and the second surface (102) to face the punch hole (200). The knockout pad (420) can be moved in the first direction and the second direction together with the knockout body (410) when the knockout body (410) is moved in the first direction and the second direction. As the knockout body (410) is moved in the second direction, the knockout pad (420) can come into contact with the bottom surface of the workpiece (A) inserted into the punch hole (200) by the punch (300) and press the workpiece (A) in the second direction. The cross-sectional area of ​​the knockout pad (420) may correspond to the cross-sectional area of ​​the punch hole (200) or be formed to be smaller than the cross-sectional area of ​​the punch hole (200). Accordingly, when the knockout pad (420) moves in the second direction, the knockout pad (420) is inserted into the punch hole (200) while in contact with the bottom surface of the workpiece (A), and the workpiece (A) can be removed from the punch hole (200) in the second direction.

[0070] The knockout pad (420) may be installed to be reciprocally movable in the first direction and the second direction with respect to the knockout body (410). That is, the knockout pad (420) may be installed to be relatively movable in the first direction and the second direction with respect to the knockout body (410), separately from the movement of the knockout body (410). In this case, the knockout pad (420) may be directly movably connected to the knockout body (410), or may be relatively movably connected to the knockout body (410) via a separate structure. When the knockout pad (420) comes into contact with the workpiece (A), it may be moved in the first direction by a reaction force generated between the knockout pad and the workpiece (A). Accordingly, the knockout pad (420) may selectively expose the stamp member (500) described below to the external space.

[0071] The knockout member (400) may further include an elastic member (430), a stopper (440), and a guide member (450).

[0072] The elastic member (430) can press the knockout pad (420) against the knockout body (410) in the second direction. The elastic member (430) can be provided to be elastically deformable. For example, the elastic member (430) can have the form of a coil spring that can be stretched along the longitudinal direction.

[0073] The elastic member (430) may be placed between the knockout body (410) and the knockout pad (420). The elastic member (430) may be placed such that its length direction is parallel to the first direction. Both ends may be fixed to the knockout body (410) and the knockout pad (420), respectively. More specifically, both ends of the elastic member (430) may be fixed to the surfaces where the knockout body (410) and the knockout pad (420) face each other, respectively, by an adhesive, welding, or the like. Both ends of the elastic member (430) may be inserted into the surfaces where the knockout body (410) and the knockout pad (420) face each other, respectively.

[0074] The elastic member (430) may be installed in a compressed state relative to the neutral state when the knockout pad (420) is positioned in the initial position relative to the knockout body (410). Accordingly, the elastic member (430) may constantly press the knockout pad (420) in the second direction relative to the knockout body (410). Specific details regarding the initial position of the knockout body (410) will be described later.

[0075] A plurality of elastic members (430) may be provided. The plurality of elastic members (430) may be arranged to be spaced apart from each other between the knockout body (410) and the knockout pad (420). The plurality of elastic members (430) may be arranged parallel to each other.

[0076] The stopper (440) can prevent the knockout pad (420) from being separated from the knockout body (410) by the elastic force of the elastic member (430).

[0077] Figure 8 is an enlarged view schematically showing the configuration of a stopper according to one embodiment of the present invention.

[0078] Referring to FIG. 8, the stopper (440) may include a first stopper (441) and a second stopper (442).

[0079] The first stopper (441) forms one side of the outer surface of the stopper (440) and can extend from the knockout body (410).

[0080] The first stopper (441) may include a first stopper body (441a) and a first hook (441b).

[0081] The first stopper body (441a) may be placed between the knockout body (410) and the knockout pad (420). One side of the first stopper body (441a) facing the knockout body (410) may be integrally fixed to the knockout body (410). The other side of the first stopper body (441a) facing the knockout pad (420) may be brought into contact with or separated from the knockout pad (420) by relative movement of the knockout pad (420) with respect to the knockout body (410).

[0082] The first hook (441b) may extend from the first stopper body (441a) in a direction intersecting the first direction. For example, the first hook (441b) may extend from the first stopper body (441a) in a direction perpendicular to the first direction, that is, in a direction parallel to the Y-axis direction with reference to FIG. 2. However, the extension direction of the first hook (441b) is not limited thereto, and various design changes may be made within the range of directions intersecting the first direction with reference to FIG. 2.

[0083] A first contact surface (441c) may be formed on the surface of the first hook (441b) facing the knockout body (410). The first contact surface (441c) may be arranged parallel to the extension direction of the first hook (441b).

[0084] The first hook (441b) may be provided in multiple numbers. The multiple first hooks (441b) may be arranged to be spaced apart from each other along the circumference of the first stopper body (441a). For example, the first hooks (441b) may be provided in pairs, and the pair of first hooks (441b) may be arranged to be spaced apart from each other by 180 degrees along the circumference of the first stopper body (441a).

[0085] The second stopper (442) may extend from the knockout pad (420). The second stopper (442) may come into contact with the first stopper (441) as the knockout pad (420) moves relative to the knockout body (410) in the second direction. Accordingly, the knockout body (410) may be restricted from moving in the second direction by the reaction force generated between the first stoppers (441).

[0086] The second stopper (442) may include a second stopper body (442a) and a second hook (442b).

[0087] The second stopper body (442a) may extend from one side of the knockout pad (420) facing the knockout body (410) toward the knockout body (410). The second stopper body (442a) may be arranged such that its length direction is parallel to the first direction. One end of the second stopper body (442a) facing the knockout pad (420) may be integrally fixed to the knockout pad (420). The other end of the second stopper body (442a) facing the knockout body (410) may be brought into contact with or separated from the knockout body (410) by relative movement of the knockout pad (420) with respect to the knockout body (410). The side surface of the second stopper body (442a) may be spaced apart from the circumferential surface of the first stopper body (441a) along a direction intersecting the first direction. For example, the second stopper body (442a) may be spaced apart in a direction parallel to the extension direction of the first stopper body (441a) and the first hook (441b).

[0088] The second stopper body (442a) may be provided in multiple units. The number of the multiple second stopper bodies (442a) may be equal to the number of first hooks (441b). Each second stopper body (442a) may be individually positioned facing the first hook (441b).

[0089] The second hook (442b) may extend from the second stopper body (442a) in a direction opposite to the extension direction of the first hook (441b). For example, the second hook (422b) may extend horizontally from the end of the second stopper body (442a) facing the knockout body (410) toward the peripheral surface of the knockout body (410). The first hook (441b) and the second hook (442b) may be sequentially arranged along the first direction.

[0090] A second contact surface (442c) may be formed on the surface of the second hook (442b) facing the first hook (441b). The second contact surface (442c) may be arranged parallel to the extension direction of the second hook (442b). Accordingly, the second contact surface (442c) may be arranged to face the first contact surface (441c) in a parallel direction with the first direction.

[0091] A plurality of second hooks (442b) may be provided. The number of the plurality of second hooks (442b) may be equal to the number of second stopper bodies (442a). Each second hook (442b) may extend individually from a different second stopper body (442a).

[0092] As the elastic member (430) presses the knockout pad (420) in the second direction, if no separate external force is applied to the knockout pad (420), the first contact surface (441c) and the second contact surface (442c) can be maintained in contact with each other. The initial position of the knockout pad (420) described above may refer to the position of the knockout pad (420) when the first contact surface (441c) and the second contact surface (442c) are in contact.

[0093] The guide member (450) can guide the relative movement of the knockout pad (420) with respect to the knockout body (410).

[0094] The guide member (450) may include a guide hole (451) and a guide rod (452).

[0095] The guide hole (451) may be formed by penetrating either the knockout body (410) or the knockout pad (420). Hereinafter, the guide hole (451) will be described as being formed by penetrating the knockout pad (420) as an example. However, the guide hole (451) is not limited thereto, and may also be formed by penetrating the knockout body (410).

[0096] The guide hole (451) may be formed to have a concave hole shape formed from one side of the knockout pad (420) facing the knockout body (410). The guide hole (451) may be arranged such that its length direction is parallel to the first direction. The guide hole (451) may be provided in multiple numbers. The multiple guide holes (451) may be arranged to be spaced apart from each other along a direction intersecting the first direction of the knockout pad (420).

[0097] The guide rod (452) may extend from the other of the knockout body (410) and the knockout pad (420). As the guide hole (451) is formed in the knockout pad (420), the guide rod (452) may be formed in the knockout body (410). The guide rod (452) may extend from one side of the knockout body (410) facing the knockout pad (420) toward the knockout pad (420). The guide rod (452) may be arranged such that its length direction is parallel to the first direction. The guide rod (452) and the guide hole (451) may be arranged coaxially. The guide rod (452) may be inserted into the inside of the guide hole (451). In this case, the guide rod (452) can be inserted into the inside of the guide hole (451) by penetrating the first stopper body (441a). The circumferential surface of the guide rod (452) can be in sliding contact with the inner surface of the guide hole (451) in a manner such that it can move. The guide rod (452) can be provided in multiple pieces. Each guide rod (452) can be individually inserted into a different guide hole (451).

[0098] The stamp member (500) is installed on the knockout member (400), and when the knockout member (400) comes into contact with the workpiece (A), a pattern (P) can be imprinted on the workpiece (A). Accordingly, the stamp member (500) can imprint the pattern (P) on the workpiece (A) during the molding process of the workpiece (A) by the punch (300), thereby further improving the production efficiency of the secondary battery case. Here, the pattern (P) can be imprinted in an engraved form on the bottom surface of the workpiece (A). The pattern (P) can have various shapes such as letters, symbols, numbers, and figures.

[0099] The stamp member (500) can be selectively brought into contact with the workpiece (A) depending on the relative movement direction of the knockout pad (420) with respect to the knockout body (410). More specifically, when the knockout pad (420) is moved in the first direction while in contact with the workpiece (A), the stamp member (500) can protrude outward from the knockout pad (420) and come into contact with the workpiece (A). When no separate external force is applied to the knockout pad (420) or the knockout pad (420) is moved in the second direction, the stamp member (500) can be positioned on the inside of the knockout pad (420) and not come into contact with the workpiece (A). Accordingly, the stamp member (500) can prevent damage to the workpiece (A) by interfering with the workpiece (A) during the transport process of the workpiece (A) when the knockout pad (420) is inserted into the punch hole (200).

[0100] The stamp member (500) may include a stamp hole (510), a stamp rod (520), and a stamp (530).

[0101] The stamp hole (510) may be formed by penetrating the knockout pad (420). Both ends of the stamp hole (510) may penetrate both surfaces of the knockout pad (420) perpendicular to the first direction. The stamp hole (510) may be arranged to face the punch hole (200). More specifically, the stamp hole (510) may be arranged to face the area where the pattern (P) is formed on the bottom surface of the workpiece (A) inserted into the punch hole (200). The stamp hole (510) may be arranged such that its length direction is parallel to the first direction.

[0102] The stamp rod (520) may extend from the knockout body (410) toward the stamp hole (510). The stamp rod (520) may have a rod shape extending from one side of the knockout body (410) facing the knockout pad (420) toward the knockout pad (420). The stamp rod (520) may be arranged such that its length direction is parallel to the first direction. The stamp rod (520) and the stamp hole (510) may be arranged such that their central axes are coaxial. The stamp rod (520) may be inserted into the stamp hole (510). The outer surface of the stamp rod (520) may be spaced apart from the inner surface of the stamp hole (510) or may be in slidable contact with the inner surface of the stamp hole (510).

[0103] The stamp (530) may extend from the stamp rod (520) and be positioned inside the stamp hole (510). More specifically, the stamp (530) may protrude in a second direction from an end surface of the stamp rod (520) positioned to face the punch hole (200). The cross-sectional shape of the stamp (530) may have a shape corresponding to the shape of the pattern (P).

[0104] When the knockout pad (420) is moved in the first direction relative to the knockout body (410) while in contact with the workpiece (A), it protrudes outward from the stamp hole (510) and presses the workpiece (A) in the second direction, thereby imprinting a pattern (P) on the bottom surface of the workpiece (A).

[0105] Figure 9 is an enlarged view schematically showing the configuration of a stamp according to one embodiment of the present invention.

[0106] Referring to FIGS. 8 and 9, the stamp (530) can protrude outwardly from the stamp hole (510) as the knockout pad (420) is moved relative to the knockout body (410) in the first direction by a first set distance (L1) from the initial position. The first set distance (L2) can be designed in various ways within a range greater than the distance between the end surface of the stamp (530) and the end surface of the stamp hole (510) facing the punch hole (200). For example, the first set distance can be 0.7 mm. When the stamp (530) is moved relative to the knockout body (410) in the first direction by the first set distance while the knockout pad (420) is in contact with the workpiece (A), the stamp (530) can press the workpiece (A) in the second direction to imprint a pattern (P) on the bottom surface of the workpiece (A).

[0107] The second stopper (442), i.e., the second stopper body (442a), can come into contact with the knockout body (410) as the knockout pad (420) moves in the first direction with respect to the knockout body (410) by a second set distance (L2) from the initial position. The second set distance (L2) may be greater than the first set distance (L1). For example, the second set distance (L2) may be 1 mm. Accordingly, the second stopper (442) can prevent the stamp (530) from protruding outward from the stamp hole (510) by delaying the time at which the second stopper body (442a) comes into contact with the knockout body (410) when the knockout pad (420) moves in the first direction from the time at which the stamp (530) protrudes outward from the stamp hole (510).

[0108] The stamp member (500) may further include a support member (540).

[0109] The support member (540) may be placed between the knockout body (410) and the stamp rod (520). The support member (540) may be connected to the knockout body (410) and the stamp rod (520) on both sides, respectively, and may support the stamp rod (520) with respect to the knockout body (410). The support member (540) may be provided to be elastically deformable. For example, the support member (540) may be formed of an elastically deformable material such as urethane, silicone, or rubber. Accordingly, the support member (540) may distribute the load applied to the stamp (530) by its own elastic deformation, thereby preventing damage to the stamp (530). The elastic deformation length of the support member (540) may be smaller than the difference between the second set distance (L2) and the first set distance (L1). For example, the elastic deformation length of the support member (540) may be 0.2 mm.

[0110] Hereinafter, the operation of a secondary battery case manufacturing device according to one embodiment of the present invention will be described.

[0111] Hereinafter, the secondary battery case manufacturing device will be described as an example of ironing a workpiece (A) preformed into a cup shape in an extrusion process. However, the operation described below can also be applied equally to the case where the secondary battery case manufacturing device extrudes a workpiece (A) in the form of a sheet.

[0112] FIGS. 10 to 15 are drawings schematically showing the operation process of a secondary battery case manufacturing device according to one embodiment of the present invention.

[0113] Referring to FIG. 10, the punch (300) is separated from the punch hole (200), the knockout pad (420) is inserted into the inside of the punch hole (200), and the workpiece (A) is transferred to a position facing the punch hole (200).

[0114] In this case, since the knockout pad (420) is positioned at the initial position by the elastic force of the elastic member (430), the stamp (530) does not protrude outside the stamp hole (510). Accordingly, the workpiece (A) can be prevented from being damaged due to collision with the stamp (530) during the transport process.

[0115] Referring to FIG. 11, the punch (300) moves in the first direction and presses the workpiece (A) toward the punch hole (200) in the first direction.

[0116] The workpiece (A) is inserted into the punch hole (200) by the pressure applied from the punch (300).

[0117] In this process, as the punch (300) is inserted into the punch hole (200) together with the workpiece (A), the thickness of the workpiece (A) is reduced by the gap between the punch (300) and the punch hole (200).

[0118] The knockout member (400) is moved in the first direction by the movement distance of the punch (300) while the knockout pad (420) is in contact with the bottom surface of the workpiece (A).

[0119] Referring to FIGS. 12 and 13, when the magnitude of the pressing force applied from the punch (300) to the workpiece (A) exceeds the elastic force of the elastic member (330), the knockout pad (420) moves relative to the knockout body (410) along the first direction.

[0120] As the knockout pad (420) moves in the first direction by a first set distance (L1) or more, the stamp (530) protrudes outward from the stamp hole (510) and presses the bottom surface of the workpiece (A) in the second direction.

[0121] Accordingly, a pattern (P) can be imprinted on the bottom surface of the workpiece (A) in the shape of the stamp (530) by the pressure applied from the stamp (530).

[0122] Referring to Fig. 14, after the forming of the workpiece (A) is completed, the punch (300) is moved along the second direction and separated from the workpiece (A).

[0123] Referring to Fig. 15, after the punch (300) is separated from the workpiece (A), the knockout member (400) moves in the second direction and presses the workpiece (A) in the second direction.

[0124] The workpiece (A) is moved in the second direction by the pressure applied from the knockout member (400) and is removed from the punch hole (200).

[0125] In this process, if the magnitude of the pressing force applied by the knockout member (400) to the workpiece (A) exceeds the elastic force of the elastic member (330), the stamp (530) can perform the same operation described in FIGS. 12 and 13 and imprint a pattern (P) on the bottom surface of the workpiece (A).

[0126] Although the present invention has been described above with reference to limited embodiments and drawings, the present invention is not limited thereto, and it is obvious that various modifications and variations are possible within the scope of the technical idea of ​​the present invention and the equivalent scope of the patent claims to be described below by a person having ordinary skill in the art to which the present invention pertains.

Claims

1. A die having a first side and a second side that are opposite to each other; A punch hole formed through the first surface and the second surface; A punch arranged to face the first surface and pressurizing the workpiece in the first direction toward the punch hole; A knockout member that is positioned facing the second surface and presses the workpiece in a second direction opposite to the first direction; and A secondary battery case manufacturing device characterized by including a stamp member installed on the knockout member and imprinting a pattern on the workpiece when the knockout member comes into contact with the workpiece.

2. In paragraph 1, The above knockout member is, A knockout body positioned facing the second surface and moving along the first direction or the second direction; and A knockout pad is installed to be reciprocally movable along the first direction and the second direction with respect to the knockout body, and is in contact with the workpiece; A secondary battery case manufacturing device characterized in that the stamp member selectively comes into contact with the workpiece according to the movement direction of the knockout pad.

3. In paragraph 2, A secondary battery case manufacturing device characterized in that the knockout pad is inserted into the punch hole as the knockout body moves along the second direction.

4. In paragraph 2, The above stamp part is, A stamp hole formed by penetrating the knockout pad and positioned facing the punch hole; A stamp rod extending from the knockout body toward the stamp hole; and A stamp extending from the stamp rod and positioned inside the stamp hole; A secondary battery case manufacturing device characterized in that the stamp protrudes outward from the stamp hole as the knockout pad moves relative to the knockout body in the first direction.

5. In paragraph 4, A secondary battery case manufacturing device, characterized in that the stamp extends from an end of the stamp rod along the second direction.

6. In paragraph 4, A secondary battery case manufacturing device characterized in that the stamp member further includes a support member that is disposed between the knockout body and the stamp rod and supports the stamp rod with respect to the knockout body.

7. In paragraph 6, A secondary battery case manufacturing device characterized in that the above support member is provided to be elastically deformable.

8. In paragraph 4, The above knockout member is, An elastic member that presses the knockout pad in the second direction; and A secondary battery case manufacturing device further comprising a stopper that prevents the knockout pad from being separated from the knockout body.

9. In paragraph 8, A secondary battery case manufacturing device characterized in that the above elastic member is a coil spring.

10. In paragraph 8, A secondary battery case manufacturing device characterized in that the elastic member is placed between the knockout body and the knockout pad.

11. In paragraph 10, A secondary battery case manufacturing device, characterized in that the elastic member is arranged with its length direction parallel to the first direction, and both ends are respectively fixed to the knockout body and the knockout pad.

12. In paragraph 8, The above stopper, a first stopper extending from the knockout body; and A secondary battery case manufacturing device characterized by including a second stopper extending from the knockout pad and coming into contact with the first stopper as the knockout pad moves relative to the knockout body in the second direction.

13. In paragraph 12, The above first stopper, A first stopper body fixed to the above knockout body; and A first hook extending from the first stopper body in a direction intersecting the first direction and having a first contact surface; The above second stopper, A second stopper body fixed to the above knockout pad; and A second hook extending from the second stopper body in a direction opposite to the extension direction of the first hook and having a second contact surface arranged to face the first hook; A secondary battery case manufacturing device, characterized in that the first hook and the second hook are sequentially arranged along the first direction.

14. In paragraph 13, A secondary battery case manufacturing device, characterized in that the first contact surface and the second contact surface are arranged parallel to each other.

15. In paragraph 12, A secondary battery case manufacturing device characterized in that the stamp protrudes outward from the stamp hole as the knockout pad moves a first set distance in the first direction relative to the knockout body from the initial position.

16. In paragraph 15, A secondary battery case manufacturing device, characterized in that the second stopper comes into contact with the knockout body as the knockout pad moves from the initial position in the first direction relative to the knockout body by a second set distance that is greater than the first set distance.

17. In any one of paragraphs 4 to 16, A secondary battery case manufacturing device characterized in that the knockout member further includes a guide member that guides relative movement of the knockout pad with respect to the knockout body.

18. In paragraph 17, The above guide member, A guide hole formed by penetrating one of the knockout body and the knockout pad; and A secondary battery case manufacturing device characterized by including a guide rod extending from the remaining one of the knockout body and the knockout pad and inserted into the guide hole.

19. In paragraph 18, A secondary battery case manufacturing device characterized in that the above guide hole and the above guide rod are arranged parallel to the first direction.

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